Novel MWNTs-Bi2WO6 composites with enhanced simulated solar photoactivity toward adsorbed and free tetracycline in water
Novel MWNTs-Bi2WO6 composites with enhanced simulated solar photoactivity toward adsorbed and free tetracycline in water
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DOI：
10.1016/j.apcatb.2015.03.043
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发表时间：
2015-10-01
影响因子：
22.1
通讯作者：
Zhu, Lingyan
中科院分区：
文献类型：
--
作者：
Yue, Longfei;Wang, Shanfeng;Zhu, Lingyan
采用水热法合成了一种新型三维介孔多壁碳纳米管-Bi 2 WO 6（MWNTs-Bi 2 WO 6）微球光催化剂，并将其用于催化降解水中四环素（TC）.与纯Bi 2 WO 6相比，MWNTs-Bi 2 WO 6复合材料的光催化活性显著提高。掺入的多壁碳纳米管促进了光生电子的转移，并增强了光生空穴和电子对的分离。此外，该复合材料在可见光区表现出较强的光吸收。MWNTs的大比表面积以及与污染物的π-π电子耦合促进了TC在光催化剂表面的吸附。结果表明，掺杂Bi 2 WO 6的MWNTs的光催化活性增强。当MWNTs的质量分数为3%时，光催化性能最好。模拟太阳光照射60 min后，3% MWNTs-Bi 2 WO 6（0.5 g/L）固体对TC（20 mg/L）的去除率几乎达到100%，降解效率比裸Bi 2 WO 6提高约35%。同时考察了吸附态TC在催化剂上的降解情况。FT-IR和DTG分析表明，吸附的TC在1小时的照射略有降解，虽然在溶液中的游离TC完全降解。随着照射时间的延长，吸附的TC也被降解。结果表明，所制备的MWNTs-Bi 2 WO 6复合材料在处理水中有机污染物方面具有很大的潜力。(C)2015 Elsevier B. V.版权所有。
A novel three-dimensional (3D) mesoporous multiwalled carbon nanotubes-Bi2WO6 (MWNTs-Bi2WO6) microsphere photocatalyst with excellent photocatalytic performance was synthesized by a facile hydrothermal method and used to catalytically degrade tetracycline (TC) in water. Compared with pure Bi2WO6, the photocatalytic activity of the MWNTs-Bi2WO6 composites was enhanced significantly. The incorporated MWNTs facilitated the photogenerated electron transfer and enhanced the separation of photogenerated hole and electron pairs. In addition, the composite displayed stronger light absorption in the visible light region. Furthermore, the large surface as well as pi-pi electron coupling with the contaminants of MWNTs promoted the adsorption of TC on the photocatalyst surface. As a result, the incorporation of MWNTs with Bi2WO6 enhanced photocatalytic activity. The best photocatalytic performance was achieved with MWNTs proportion of 3%. Almost 100% of TC (20 mg/L) was removed by the solids of 3% MWNTs-Bi2WO6 (0.5 g/L) after irradiation with simulated solar light for 60 min and the degradation efficiency increased about 35% compared with the bare Bi2WO6. The degradation of the adsorbed TC on the catalyst was also investigated. The FT-IR and DTG analyses demonstrated that the adsorbed TC was slightly degraded in 1 h irradiation although the free TC in solution was completely degraded. As the irradiation extended for 3 h, the adsorbed TC was also degraded. The results indicated that the prepared MWNTs-Bi2WO6 composite has great potential for treatment of organic pollutants in water. (C) 2015 Elsevier B.V. All rights reserved.